@article{DE_1997_33_3_a14,
     author = {Yu. V. Churin},
     title = {On the change in the number of discontinuity points of singular periodic solutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {385--389},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_3_a14/}
}